Revolving grate.



PATENTED JAN. 28, 1908.

P. BURGER.

REVOLVING GRATE.

APPLIOATION FILED FEB, 15, 1905 2 SHEETS-SHEET 1.

wherein I have illustrated parts of an embodiment of my invention sufficient to enable boiler and fuel-feeding devices; and Fig. 3 .is

I suitable mechanism, preferably from adapted for use in furnaces and capable of UNITED STATES PATENT OFFICE.

FRANZ BURGER, OF FORT WAYNE, INDIANA, ASSIGNOR OF THREE-FOURTHS TO HENRY M.

WILLIAMS, OF FORT WAYNE, INDIANA.

REVOLVINGGRATE.

Specification of Letters Patent.

Patented Jan. 28, 1908.

To all whom it may concern:

Be it known that I, FRANZ BURGER, a citizen of the United States, residing at Fort Wayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Revolving Grates, of which the following is a specification.

My invention relates to revolving grates. adapted for use in connection with furnaces, and it has for its object to provide an improved grate of the character specified, and to these ends my invention consists in the various features of construction and arrangement of parts having the mode of operation substantially as hereinafter more particularly set forth.

Referring to the accompanying drawings,

those skilled in the art to understand its mode of construction and arrangement, Figure 1 is a sectional view, showing some of the parts at dilferent elevations, of a portion of a grate and connecting devices; Fig. 2 is a vertical section of the grate and part of the a partial side View in part section-on the line ab, Fig. 2.

I have not deemed it necessary to illustrate a complete grate, but have preferred to show all the essential features of construction and arrangement of parts on a larger scale in a manner so that they will be readily understood by those skilled in the art.

My present invention, generally stated, has for its object to provide a revolving grate.

being revolved, preferably intermittently, and such a grate which not only revolves itself, but is provided with a series of gratebars which are capable of rotation in the grate and are arranged to be rotated by SOS) 1e power used to revolve the grate. Further these grate-bars are of peculiar shape and configuration and are adapted to aid in disfeatures of invention will appear from the description of the embodiment of the invention disclosed in the drawing.

p The grate frame is shown in the form of a spider 1.- Thismay be supported in the furnace in any suitable way, and I have shown 1 in the present instance a central fuel-feeding .tube 2, provided with a collar 4 upon which the ring or rim 3 of the spider or frame rests. The outer rim or portion 5 of the spider or frame may be suitably supported in connection with the fire-box 16, and I have showna portion of such fire-box wherein the baseplate 15, is extended inwardly to form a track or rim to support the outer portion of the of the grate-bar rim 5. It is general y pref- .erable to revolve the grate intermittently,

and for this urpose any suitable motor may be used.- I- ave shown a motor cylinder 22,

containing a piston 21, having a piston rod 20, to which is pivotally connected a pawl 19, shown with a weight 25, and there is a suitable valve 23 adapted to control the motor fluid for the motor or engine, so that the pisportion ton will be reciprocated therein'and the pawl I will operate to successively engage the teeth of the ratchet rim and cause an intermittent or ste'p-by-step revolution of the grate. Suit able connections may be sup hed whereby the valve will be automaticalfy operated to cause the intermittent or step-by-step revolution of the grate.

Mounted on the grate frame or spider is a series of grate-bars 7, and these are shown as of a general conical contour, tapering from the outside toward the center. Their inner ends are mounted in slots or bearings 6 in the ring 3, while the outer ends of said grate-bars are .preferably proyided with projections formed in the s ape of axles 8 which are -mounted in the slots or bearings 6 inthe outer rim 5 of the grate.

The rate-bars are provided on their surfaces with projections or teeth 14 of any desired shape, preferably such as clearly indicated in the drawing, and these teeth are arranged spirally upon the surfaces of the grate-bars in such a way that @they have a tendency to cause the fuel to move outward 10 the inner fire-box sheet.

from the center of the grate as the grate-bars are rotated.

' e various means may be used to cause the grate-bars to rotate, I have shown 5 the axles 8 as provided with pinions 9 fixed thereon, which pinions areadapted to engage a stationary rack 13, and this rack in t e resent instance is formed in the under surace of the rim or projection 11 fastened to rim 11 has a downward projection at its inner edge, which is shown. as arranged to enter a space between thepinion 9 on the axle 8 and the enlarged ortion of the grate-bar. 15 In this way not onfy does the stationary rim com rise a rack-bar, but the downwardly ex- .ten ed flange aids in protecting the operat-.

mg mechamsm of the and dirt.

It will be seen that/as the ate frame 1 is revolved, carrying the grateam in bearings on the frame, the inions on the independent bars will enga e t e stationary rack and all of the bars wi be rotated in accordance with the revolution of the ate, and as that is preferably intermittent y revolved or moved stepbystep, so too will the grate-bars be rotated on their axes step-by-st'ep. This is I accomplished bya single motor operating preferablydirectly upon the revolving 'rate.

While the fuel may be supplied to t e revolving grate in any desired way, either from grate-bars from dust above'or below, it is referable to sup ly it from below, and'for th1s purpose I have s own the fuel-feeding tube 2 which, as before stated, also forms a illFpOl't for the inner ortion of-the grate. ceding tube is preferably some means for delivering the fuel at the center of the grate,

' 40 and I have indicated a shaft 30,- supporting an elevatingscrew 27 and having a worm wheel 29 adapted to be operated by a worm 31 which may be driven by any suitable power, either continuously or intermittently.

he fuel is supplied to the worm through the feed tube 28, and as the worm rotates it-is gradually lifted through the fuel feeding tube and tends to spread itself over the surroundgrate. In order to aid this spreading thev inner rim of the grate is provide with a num:

" ber of wiper bars or fingers 26, which tend to stirthe fuel and cause it to spread more.

readily Wer the'rotating grate-bars, and as these are intermittentl rotated they tend to move the fuel toward tfiebuter portion of the grate and at the same time to keep the fuel clean and free from dust and ashes; u While I have thus indicated" the general features of construction and arran ement of my, grate and have described a pre erred-embod1ment thereof and pointed out in general-g5 the mode of operation of the parts, it will'be understood that my invention is not limited to the specific details of construction shown and described, but'maybe varied by'those This stationary described.

ounted in this fuel for rotating and means for simultaneously and intermittently revolving the grate and .rotatiiig so the grate-bars step by step, substantially as described. 1

3. The combination with a central fuel feeding tube, of a revolving rate, rotating grate-bars mounted radially t ereon, and-a 35 motor connected to simultaneously and intermittently revolve the grate and rotate the grate bars step by step, substantially as 4. The combination with a rate, of rotating grate-bars mounted radial y thereon and havin conicalshaped body portions, said gratears being provided withteeth s -irally arranged on said body portions, su stan-. tially as described. 5'. The combination with a suitable support, of'a revolving grate, rotating conical grate-bars mounted in bearings on the grate and having teeth spirally-arranged on them surfaces, and means for rotating the gratebars, substantially as.described.

6. The combination with a central fuelfeeding tube, of a revolving grate, means for 'IGVOlVlIl the same intermittently, gratebars ra ially mounted on the grate, and means for rotating the grate-bars, substantially as described.

7. The combination with the central fuel-feeding tube, of a revolving grate having wi ers extending over the face of the tube, su stantially as described;

-8. The combination with the central fuel-feeding tube, ofa revolving grate having wipers' extending over the face of the tube, rotating grate-bars mounted on' the grate and provided with spirally arranged teeth, and means for rotatmg the grate-bars, whereby the fuel will be spread outwardly fromthe central tube, substantially as described.

9.. The combination with the centrai fuel-feeding tube, and means for feeding fuel therethrough, of a revolvinggrate', means for revolving the grate, rotating grate-bars radially -moun t ed e grate-bars, substantially as described. 10. The combination withthe central fuel-feeding'itube and means for feeding fuel therethrough, of a revolving grate having 130 on the grate, and means rotating grate-bars provided at their oriter I In testimony whereof I have signed my ends with axles .and inions mounted name to this specification 1n the presence thereon, a stationary rac -bar above said of two subscribing witnesses.

pinions, a flange on said rack-bar extending FRANZ BURGER. 6 downward between the pinions and the ends Witnesses: 1

of the grate-bars, and means for revolting GEO. K.- TORRENCE,

the grate. v .C. B. WATERS. 

